My father remembers travelling by boat from the vicinity of Trier to Koblenz, some 25 years ago. Now he would like to travel by boat again on the Mosel to Koblenz (and maybe back again some days later). So far I have found one company organizing a similar journey in the opposite direction from Koblenz to Cochem : https://www.k-d.com/en/cruises/scheduled-cruises-on-the-moselle/
Are there any other companies offering such trips. We are not looking for one-day roundtrip cruises, as these are offered abundantely.